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Publication numberUS3977349 A
Publication typeGrant
Application numberUS 05/594,529
Publication dateAug 31, 1976
Filing dateJul 9, 1975
Priority dateNov 27, 1974
Publication number05594529, 594529, US 3977349 A, US 3977349A, US-A-3977349, US3977349 A, US3977349A
InventorsMax Hummel
Original AssigneeMax Hummel
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Boat positioning device
US 3977349 A
Abstract
A boat is equipped with a positioning device for adjusting its depth position in response to the load of the boat and a pressure space such as a flexible bag is disposed between oppositely arranged trim tabs, the position of the trim tabs being controlled by the pressure in the pressure space, so that by change of the pressure the positioning of the boat in the water is changed accordingly in response to the load of the boat.
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Claims(1)
I claim:
1. A boat comprising
a hull with a stern and a bottom,
at least a lower trim tab pivotally secured to said hull, to provide a hinge connection between said lower trim and said hull,
expansible chamber means disposed above said lower trim tab,
a fitting secured to said hull of the boat,
a rod pivotally secured to said lower trim tab and a helical spring surrounding said rod and countering the pressure present in said expansible chamber means,
a filler tube extending through said hull into said expansible chamber means adapted to increase and decrease, respectively, the pressure in said expansible chamber means,
a pump connected with said filler tube for feeding and releasing, respectively, fluid into said expansible chamber means,
said expansible chamber means comprising a flexible bag, a conduit leading said filler tube into a housing, two two-way valves disposed in said housing, said two two-way valves being in operative connection with a pump, and
switches controlling the bidirectional operation of said pump.
Description

This is a Continuation-in-Part application of the copending patent application Ser. No. 527,747, filed Nov. 27, 1974 and now abandoned.

The present invention is concerned with water-going vessels such as boats and relates to a device intended to influence the attitude or course of the vessel in the water by means of a control surface such as a trim surface which coacts with the bypassing water while generating control forces exerted on the vessel.

It is one object of the present invention to provide a boat positioning device which includes means for adjusting the depth of the boat responsive to the load of the boat.

It is another object of the present invention to provide means for adjusting the depth of the boat in response to the load of the boat which comprises at least one bottom trim tab or two trim tabs in parallel arrangement and provided at the bottom of the boat, an upper trim tab being affixed to the bottom face of the boat, while a lower trim tab is hingedly connected to the upper trim tab.

It is still another object of the present invention to provide a boat positioning device which includes resilient means for maintaining the bottom tab in its lowermost position when the load present on the boat is not very great.

It is still a further object of the present invention to provide a boat positioning device which includes a preferably plastic bulb or bag, to form a pressure space, which is preferably disposed between the upper trim tab and the lower trim tab or between the bottom of the boat and the lower trim tab and is inflated with a gaseous or a liquid fluid, such as air or water to force the bottom trim tab downwardly, as the pressure in the pressure space is to be increased.

It is yet another object of the present invention to provide a boat positioning device wherein either a through hull fitting extends through the bottom of the boat for each set of the tabs or a fitting is provided preferably adjacent the stern side of the hull of the boat.

With these and other objects in view, which will become apparent in the following detailed description, which is shown by example only, the present invention is clearly disclosed in the accompanying drawings, in which:

FIG. 1 is a vertical section of a fragmentary portion of a boat disclosing a lower and an upper tab;

FIG. 2 is a bottom plan view of the bottom tab;

FIG. 3 is a vertical section of a fragmentary portion of a boat disclosing a lower and an upper tab in connection with another embodiment of the present invention; and

FIG. 4 is a schematic showing of the compression chamber in operative connection with the compressor controlled by solenoid valves.

Referring now to the drawing and in particular to FIGS. 1 and 2, a boat, a bottom portion 1 of which is shown in FIG. 1, has a stern side 2. Two trim tabs are arranged, thereby providing an upper tab 3' and a lower tab 32. For each set of tabs a through hull fitting 4 extends through the bottom 1 of the boat, which fitting is secured to the latter by means of an appropriate nut 5. A cover 6 is secured to the outer periphery of the through hull fitting 4 to enclose a rod 7 and preferably also a tubing (not shown).

A helical spring 8 surrounds the rod 7 and engages at its bottom a ring face of the fitting 4 and at its top an abutment plate 9, the latter being properly secured to the rod 7. The bottom of the rod 7 is preferably pivotally mounted on the lower tab 32 and the forward end of the tab 32 has an upwardly bent portion 10 to terminate close to the stern end 2 of the bottom 1 of the boat.

A bag or flexible bulb 11 is disposed between the upper tab 3' and the lower tab 32 and a filling tube 12 leads through the bottom 1 of the boat to the pressure space of the bag or bulb for the purpose to feed air, or any liquid or gaseous fluid into the bulb 11 and to create an increase or decrease, respectively, of the inner pressure of the bag or bulb 11. Upon increase of the pressure inside of the bulb the helical spring 8 will either be compressed or extended depending upon the weight or the load bearing on the boat thereby changing the position of the bottom of the boat relative to the surrounding water.

The filling tube 12 leads through a conduit 13 to a housing 14 containing two two-way valves which are in operative connection with a manual or electrical pump 15 by means of switches 16 controlling the bidirectional operation.

The lower tab 32 is connected with the upper tab 3' as well as with the bottom 1 of the boat by means of a plurality of bolts 17 to bring about a hinge effect between the upper and the lower tabs in order to increase or decrease the pressure in the pressure space depending upon requirements.

Referring now again to the drawings and in particular to FIGS. 3 and 4, a boat, a bottom portion 1' of which is shown in FIG. 3, has a stern side 2'. This embodiment is substantially identical with the embodiment disclosed in FIGS. 1 and 2 with the exception that the through hull fitting 4 as shown in FIG. 1 of the drawings is replaced by a fitting disposed outside the hull of the boat preferably adjacent the stern side 2' thereof. Accordingly, at least a bottom trim tab or two trim tabs, namely an upper trim tab and a lower trim tab are arranged also in the second embodiment of the present invention, thereby providing an upper tab 3a' and a lower tab 3a 2. Said trim tabs 3a' and 3a2 are secured to the boat hull by means of screws 9a' and 10a'. A cover 4' is secured to the fitting to enclose a rod 7'.

A helical spring 8' surrounds the rod 7' and engages at its bottom a ring face of the fitting and at its top an abutment plate 9', the latter being properly secured to the rod 7'. The bottom of the rod 7' is preferably pivotally mounted on the lower tab 3a 2 and the forward end of the tab 3a2 has an upwardly bent portion 10' to terminate close to the stern end 2' of the bottom 1' of the boat.

As in the previously described embodiment a bag or flexible bulb 11a is disposed between the upper tab 3a' and the lower tab 3a2 and a filling tube 12' leads through the stern side of the boat and enters the pressure space of the bag or bulb 11a for the purpose to feed air, or any liquid or gaseous fluid into the bulb 11a and to create an increase or decrease, respectively, of the inner pressure of the bag or bulb 11a. Upon increase of the pressure inside the bulb 11a the helical spring will either be compressed or extended depending upon the weight of the load bearing on the boat, thereby changing the position of the bottom of the boat relative to the surrounding water.

As in the previous embodiment, the filling tube 12' leads through a conduit 13' to a housing 14' containing two two-way valves and from there to a compressor 15' controlling the bidirectional operation.

As indicated in connection with FIG. 2 of the first embodiment, the second embodiment likewise connects the lower tab 3a2 with the upper tab 3a' or with the bottom 1' of the boat by means of a plurality of bolts 17' to bring about a hinge effect between the upper and lower tabs in order to decrease the pressure in the pressure space depending upon the requirements. In the second embodiment a pressure chamber 5' is provided between the filling tube 12' and the conduit 13'.

The boat positioning device which is designed for the adjustment of the depth position of the boat in response to its load is operated in the following manner:

As indicated above the housing 14' includes two two-way valves depending upon the desire of increasing or decreasing the pressure in the pressure space. For this purpose the switches 16 control a bidirectional operation in order to control the direction of the flow of the fluid into or out of the pressure space or of the bulb, respectively. The pressure inside the pressure space will always balance out with the pressure created by the helical spring 8' and will accordingly change the position of the lower tab 32 and thereby the position of the boat in the water.

While I have disclosed two embodiments of the present invention, it is to be understood that these embodiments are given by example only and not in a limiting sense.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2265206 *Sep 13, 1939Dec 9, 1941Stampfi Walter JHydroplane boat
US3298344 *Sep 20, 1965Jan 17, 1967Southern John PAutomatic trim correction
US3413948 *Sep 12, 1966Dec 3, 1968Chris Craft Ind IncFluid pressure controlled planing and trim means for water craft
US3496899 *May 16, 1968Feb 24, 1970Weber Milton NPneumatic trim device
US3589323 *Mar 26, 1969Jun 29, 1971Kercheval Frank TThrough-the-bottom boat leveler construction
US3604383 *Dec 23, 1968Sep 14, 1971Hesselman Bil Aero AbTrim attachment for power boats
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4854259 *Oct 14, 1988Aug 8, 1989Sta-Rite Industries, Inc.Improved trim-tab control system for power boats
US5450643 *Oct 4, 1993Sep 19, 1995Kelley Company Inc.Edge-of-dock leveler
US5621938 *Sep 8, 1995Apr 22, 1997Kelley Company, Inc.Edge-of-dock leveler and method of making
US6089177 *Jun 8, 1998Jul 18, 2000Mueller; PeterTrim tab and variable-exhaust system especially for motor boats and motor yachts
US6167830Dec 6, 1999Jan 2, 2001Don T. PilgerBoat trim tabs
US6460212Dec 3, 2001Oct 8, 2002Kelley Company, Inc.Dock leveler having an inflatable member
US6711774Aug 16, 2002Mar 30, 2004Kelley Company, Inc.Dock leveler having an inflatable member
US6760944Feb 18, 2003Jul 13, 2004Kelley Company, Inc.Dock leveler having an inflatable member
US6910239May 14, 2004Jun 28, 2005Kelly Company, Inc.Dock leveler having an inflatable member
US7143711 *Apr 7, 2006Dec 5, 2006Wolske James P VonTrim tab shape control system
US7318389 *Aug 3, 2006Jan 15, 2008Boning Automationstechnologie Gmbh & Co. KgDevice and method for controlling trimming flaps on a watercraft, as well as a watercraft having a corresponding device
US7503089Apr 5, 2005Mar 17, 2009Rite-Hite Holding CorporationInflatable actuator for a dock leveler deck
US7905193Mar 15, 2011Johnson Outdoors Inc.Trim tabs
US20040205913 *May 14, 2004Oct 21, 2004Kelley Company, Inc.Dock leveler having an inflatable member
US20040221404 *Apr 28, 2003Nov 11, 2004Brian BenderDouble-wall inflatable column assembly for a dock leveler
US20060218731 *Apr 5, 2005Oct 5, 2006Tim MuhlInflatable actuator for a dock leveler deck
US20070077829 *Aug 3, 2006Apr 5, 2007Gunther BoningDevice and method for controlling trimming flaps on a watercraft, as well as a watercraft having a corresponding device
WO1991017917A1 *May 16, 1991Nov 28, 1991Dowty Woodville Polymer LimitedA submarine
WO2005118384A1 *Jun 3, 2005Dec 15, 2005J & C Hodges Nominees Pty LtdApparatus for adjusting trim of a marine hull
Classifications
U.S. Classification114/287
International ClassificationB63B39/06
Cooperative ClassificationB63B39/061
European ClassificationB63B39/06B